CN102478636B - Electric quantity detection method and device for battery - Google Patents

Electric quantity detection method and device for battery Download PDF

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Publication number
CN102478636B
CN102478636B CN201010575004.4A CN201010575004A CN102478636B CN 102478636 B CN102478636 B CN 102478636B CN 201010575004 A CN201010575004 A CN 201010575004A CN 102478636 B CN102478636 B CN 102478636B
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voltage
described
battery
change
current
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CN201010575004.4A
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CN102478636A (en
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张小生
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比亚迪股份有限公司
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Abstract

The invention provides an electric quantity detection method and device for a battery. The method comprises the following steps: sampling the voltage of a battery; comparing the sampled voltage with a voltage on a constant-current discharge curve, thus obtaining a voltage section which the sampled voltage belongs to; calculating the current voltage change rate of the battery; comparing the current voltage change rate with the test voltage change rate of the voltage section, thus obtaining a voltage change rate error; searching a preset correspondence relationship table of the range of the voltage change rate error under the voltage section and voltage regulation values for the voltage regulation value corresponding to the voltage change rate error under the voltage section; calculating the voltage of the battery based on the sampled voltage and the found voltage regulation value; and obtaining the electric quantity of the battery based on the calculated battery voltage. The embodiment of the invention can realize the accurate electric quantity measurement of the battery without a precise mathematical model of the battery discharge curve.

Description

The detection method of battery electric quantity and device

Technical field

The present invention relates to mobile terminal manufacturing technology field, particularly a kind of detection method and device of the battery electric quantity for mobile terminal.

Background technology

At present, for example, battery electric quantity for mobile terminal (mobile phone) detects, conventionally first the battery constant-current discharge curve of battery is carried out to segmentation so that this battery constant-current discharge curve is divided into multiple voltage sections, and for each voltage section, a fixing adjusted value is set, then according to the size of discharge current, the cell voltage detecting is carried out to certain compensation, for example select to increase or reduce this fixing adjusted value according to voltage section corresponding to cell voltage, by the compensation of voltage to obtain the comparatively real dump energy of battery.But the present inventor is carrying out finding in research and practice process to prior art: in constant-current discharge test, adopt said method, can proofread and correct preferably cell voltage, obtain dump energy more accurately, but battery in actual use, the not situation of constant-current discharge always, sometimes may there is acute variation, now adopt said method to compensate, cannot reflect battery true electric weight at that time, and the battery electric quantity information of the true electric weight of substantial deviation causes puzzlement can to battery management and user's judgement.

Summary of the invention

Object of the present invention is intended to solve above-mentioned technological deficiency, particularly solves battery electric quantity and detects inaccurate defect.

For achieving the above object, one aspect of the present invention proposes a kind of detection method of battery electric quantity, comprises the following steps: the voltage to described battery is sampled; Voltage on sampled voltage and constant-current discharge curve is compared, obtain the affiliated voltage section of described sampled voltage, wherein, described constant-current discharge curve obtains in advance described battery being carried out to constant-current discharge test, and is divided at least two voltage sections according to slope; Calculate described battery current voltage rate of change; The trial voltage rate of change of described current voltage rate of change and affiliated voltage section is compared and obtains voltage change ratio error, and wherein, described trial voltage rate of change changes test acquisition for described battery being carried out under affiliated voltage section to discharge current; The corresponding voltage change of described voltage change ratio error under voltage section under searching in the mapping table of voltage change ratio error range and voltage change from preset affiliated voltage section, wherein, described mapping table changes test acquisition by described discharge current; Calculate the voltage of described battery according to described sampled voltage and the voltage change finding; Obtain the electric weight of described battery according to the voltage of the battery of described calculating.

The present invention has also proposed a kind of pick-up unit of battery electric quantity on the other hand, comprise: memory module, for preserving the battery constant-current discharge curve with at least two voltage sections, the mapping table of voltage change ratio error range and voltage change under each voltage section in trial voltage rate of change and described battery constant-current discharge curve, wherein, described constant-current discharge curve obtains in advance described battery being carried out to constant-current discharge test, and described multiple voltage section is divided and is obtained according to described constant-current discharge slope of a curve, described trial voltage rate of change obtains for described battery being carried out under affiliated voltage section to discharge current variation test, described mapping table changes test by described discharge current and obtains, voltage sample module, for sampling to current voltage, comparison module, for comparing the voltage on sampled voltage and constant-current discharge curve to obtain the voltage section under described sampled voltage, computing module, for calculating described battery current voltage rate of change, voltage change ratio error calculating module, for comparing to obtain voltage change ratio error by the trial voltage rate of change of described current voltage rate of change and affiliated voltage section, table look-up module, the corresponding voltage change of described voltage change ratio error under voltage section under searching in the mapping table for voltage change ratio error range and voltage change the affiliated voltage section of preserving from described memory module, voltage computing module, for calculating the voltage of described battery according to described sampled voltage and the voltage change finding, electric weight computing module, for obtaining the electric weight of described battery according to the voltage of the battery of described calculating.

The embodiment of the present invention is for different voltage sections and different discharge current values, by choosing different voltage changes, magnitude of voltage is proofreaied and correct again, and then obtain battery electric quantity, therefore the embodiment of the present invention does not need the mathematical models of battery discharge curve can realize the accurate measurement of battery electric quantity.By the trial voltage rate of change of current voltage rate of change and affiliated voltage section is compared and obtains voltage change ratio error, and voltage change corresponding to described voltage change ratio error under voltage section under searching from preset mapping table, to the adjustment of sampled voltage, make the battery electric quantity actual electric weight of reaction cell exactly calculating, therefore not only avoided occurring the unordered and rambling variation of electric weight on customer mobile terminal, also can avoid in battery management process, occurring maloperation based on wrong battery electric quantity.

The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.

Brief description of the drawings

The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviously and easily and understand, wherein:

Fig. 1 is the detection method process flow diagram of the battery electric quantity of the embodiment of the present invention;

Fig. 2 is the structural drawing of the pick-up unit of embodiment of the present invention battery electric quantity.

Embodiment

Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar module or has the module of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.

Because the multidate information of battery discharge curve is very complicated, be difficult to describe by accurate mathematical model.The embodiment of the present invention is different from the unified compensating parameter of conventional employing, chooses different voltage changes, so that magnitude of voltage is proofreaied and correct for different voltage sections and different discharge current values.By using fuzzy theory can realize the obfuscation of voltage change ratio deviation, go for the situation of the voltage acute variation of battery in battery discharge procedure, thereby obtain battery electric quantity change curve accurately.

As shown in Figure 1, be the detection method process flow diagram of the battery electric quantity of the embodiment of the present invention, the method comprises the following steps:

Step S101, carries out constant-current discharge test to obtain battery constant-current discharge curve.In a preferred embodiment of the invention, can choose 100mA, 200mA, 300mA and tetra-typical constant-current discharge electric currents of 500mA, carry out respectively 5 primary cell constant-current discharge tests, draw battery constant-current discharge curve to average respectively, thereby obtain the empirical data of battery constant-current discharge.Certainly these it will be appreciated by those skilled in the art that and also can select in other embodiments of the invention other discharge currents, or also can increase or reduce the number of times of electric current constant-current discharge test, within all should be included in protection scope of the present invention.

Step S102, is divided into multiple voltage sections according to the slope of battery constant-current discharge curve various piece and empirical value by battery constant-current discharge curve.For example, the curved portion by slope variation within the scope of certain predetermined is divided into a voltage section, and described preset range can need to be adjusted according to electric weight accuracy computation.In the schematic embodiment of the present invention, can the constant-current discharge curve obtaining be divided into three sections according to slope of a curve, thereby obtain three cell voltage sections.

Step S103, carries out discharge current for described each voltage section and changes test to obtain trial voltage rate of change.In the present embodiment, discharge current changes test and comprises that discharge current increases and continue the test that the schedule time reduces afterwards again, and/or, the test that discharge current increases after reducing and continue the schedule time again.For example, for above-mentioned three different voltage sections, carry out respectively the discharge current increase suddenly experiment that also duration T c then reduces suddenly to obtain corresponding discharge curve.In an embodiment of the present invention, the moment t0 that increases and voltage V0 and voltage be can record current start and moment t2 and voltage V2 substantially stably become.According to formula dV/dt=(V2-V0)/(t2-t0) can try to achieve trial voltage rate of change, try to achieve at electric current and change suddenly the average voltage change ratio starting in the time interval after steadily.In one embodiment of the invention, 4 values such as duration T can choose 10 seconds, 30 seconds, 1 minute and 10 minutes are tested, thereby obtain 4 voltage change ratios to average, and according to mean value calculation trial voltage rate of change.Reduce then slow increase and experiment stably for electric current equally, try to achieve equally the average voltage change ratio in electric current changes suddenly the time interval after starting extremely steadily suddenly.

Step S104, determines the voltage change ratio error range of each voltage section correspondence and the mapping table of voltage change according to trial voltage rate of change and test findings.For example, for the example of above-mentioned three voltage sections, just need to set up three corresponding mapping tables.Wherein, in one embodiment of the invention, mapping table comprises successively four scopes such as the first error range (in negative less or negative), the second error range (negative larger), the 3rd error range (negative very large) and the 4th error range (just) that increase.And corresponding the first voltage change of the first error range, the corresponding second voltage adjusted value of the second error range, the tertiary voltage adjusted value that the 3rd error range is corresponding.Particularly, in one embodiment of the invention, the first voltage change is zero, and second voltage adjusted value, tertiary voltage adjusted value and the 4th voltage change are determined by the empirical value of battery constant-current discharge.Wherein, above-mentioned negative less, negative in, descriptions such as negative larger be only schematic, its concrete scope need to be adjusted according to the electric weight precision of required calculating.As shown in the table:

Voltage change ratio error The value that voltage need to cut The first error range (in negative less or negative) ??0 The second error range (negative larger) The first voltage change (V1) The 3rd error range (negative very large) Second voltage adjusted value (V2) The 4th error range (just) Tertiary voltage adjusted value (V3)

Although certainly it will be appreciated by persons skilled in the art that and be provided with four error ranges in the above embodiment of the present invention, also can correspondingly increase or reduce in other embodiments of the invention the number of error range.Preferably, the first voltage change, second voltage adjusted value and tertiary voltage adjusted value are determined by the empirical value of battery constant-current discharge, can determine by the empirical value in a large amount of experimentations, also may be different for its corresponding threshold value of battery of dissimilar or model.

Step S105, samples to current voltage, and determines affiliated voltage section and calculate current voltage rate of change according to sampled voltage and sampling period.

Step S106, the voltage change ratio error range of voltage section correspondence under searching according to current voltage rate of change and trial voltage rate of change and the mapping table of voltage change are to determine voltage change.In a specific embodiment of the present invention, first calculate the ratio between current voltage rate of change and trial voltage rate of change, then the error range falling into according to this ratio is determined voltage change, for example, can fall into the first above-mentioned error range, the second error range, the 3rd error range or the 4th error range.

Step S107, calculates the voltage of battery according to sampled voltage and definite voltage change.In embodiments of the present invention, because sampled voltage also can big ups and downs in the time that electric current changes suddenly, therefore preferably can select the sampled voltage in a sampling time to calculate, certainly also can select the current sampling time to calculate in other embodiments of the invention.For example, suppose that V0 was the sampled voltage in a upper sampling time, be actual voltage value V0 when ratio falls into the voltage that the first error range calculates; In the time that ratio falls into the second error range, choose the first voltage change V1, the voltage Vr=V0-V1 calculating; In the time that ratio falls into the 3rd error range, choose second voltage adjusted value V2, the voltage Vr=V0-V2 calculating; In the time that ratio falls into the 4th error range, choose tertiary voltage adjusted value V3, the voltage Vr=V0-V3 calculating.Like this, just can obtain accurate battery voltage value by the embodiment of the present invention.

Step S108, detect the electric weight of battery and report according to the magnitude of voltage of the battery calculating, because the present invention selects corresponding voltage change to compensate sampled voltage according to error range corresponding to sampled voltage, therefore the battery electric quantity calculating according to the magnitude of voltage after compensation can match with the actual electric weight of battery, therefore user not only can not see that on mobile terminal battery electric quantity demonstration is uprushed or the phenomenon of anticlimax, can avoid in battery management process, occurring maloperation based on wrong battery electric quantity yet.

Be understandable that, in the present embodiment, step S101 to S104 need to not need to carry out in the time of each measurement battery electric quantity, but can obtain and set in advance by pre-trial, and in the testing process of battery electric quantity, described cell voltage is sampled, voltage on sampled voltage and preset constant-current discharge curve is compared, obtain the affiliated voltage section of described sampled voltage, and calculate current voltage rate of change, by described current voltage rate of change and preset trial voltage rate of change error, and voltage change corresponding to described voltage change ratio error under voltage section under searching in the mapping table of voltage change ratio error range and voltage change from preset affiliated voltage section, and then calculate the voltage of described battery according to described sampled voltage and the voltage change that finds, then obtain the electric weight of described battery according to the voltage of the battery of described calculating.

As shown in Figure 2, be the structural drawing of the pick-up unit of embodiment of the present invention battery electric quantity.This pick-up unit comprises memory module 100, voltage sample module 200, comparison module 300, computing module 400, voltage change ratio error calculating module 500, table look-up module 600, voltage computing module 700 and electric weight computing module 800.Memory module 100 is for preserving the battery constant-current discharge curve with multiple voltage sections, the mapping table of voltage change ratio error range and voltage change under each voltage section in trial voltage rate of change and described battery constant-current discharge curve, wherein, described constant-current discharge curve obtains in advance described battery being carried out to constant-current discharge test, and described multiple voltage section is divided and is obtained according to described constant-current discharge slope of a curve, described trial voltage rate of change obtains for described battery being carried out under affiliated voltage section to discharge current variation test, described mapping table changes test by described discharge current and obtains.Voltage sample module 200 is for sampling to current voltage.Comparison module 300 is for comparing the voltage on sampled voltage and constant-current discharge curve to obtain the voltage section under sampled voltage.Computing module 400 is for calculating described battery current voltage rate of change.Voltage change ratio error calculating module 500 is for comparing to obtain voltage change ratio error by the trial voltage rate of change of current voltage rate of change and affiliated voltage section.The corresponding voltage change of voltage change ratio error under voltage section under searching in the mapping table of table look-up module 600 for voltage change ratio error range and voltage change the affiliated voltage section of preserving from memory module 100.Voltage computing module 700 is for calculating the voltage of described battery according to described sampled voltage and the voltage change finding.Electric weight computing module 800 is for obtaining the electric weight of described battery according to the voltage of the battery calculating.

In one embodiment of the invention, also comprise display module 900, be presented at the interface of mobile terminal for the electric weight of battery that electric weight computing module 800 is calculated.

In one embodiment of the invention, discharge current changes test and comprises: discharge current increases and continue the test that the schedule time reduces afterwards again, and/or, the test that discharge current increases after reducing and continue the schedule time again.

In one embodiment of the invention, wherein, described voltage change ratio error range comprises the first error range, the second error range, the 3rd error range and the 4th error range that increase successively, described voltage change comprises the first corresponding with voltage change ratio error range successively voltage change, second voltage adjusted value, tertiary voltage adjusted value, the 4th voltage change, described the first voltage change is zero, and described second voltage adjusted value, tertiary voltage adjusted value and the 4th voltage change are determined by the empirical value of battery constant-current discharge.

In one embodiment of the invention, described sampled voltage was the sampled voltage in a upper sampling period.

The embodiment of the present invention is for different voltage sections and different discharge current values, by choosing different voltage changes, magnitude of voltage is proofreaied and correct, and then obtain battery electric quantity, therefore the embodiment of the present invention does not need the mathematical models of battery discharge curve can realize the accurate measurement of battery electric quantity.By the trial voltage rate of change of current voltage rate of change and affiliated voltage section is compared and obtains voltage change ratio error, and voltage change corresponding to described voltage change ratio error under voltage section under searching from preset mapping table, to the adjustment of sampled voltage, make the battery electric quantity actual electric weight of reaction cell exactly calculating, therefore not only avoided occurring the unordered and rambling variation of electric weight on customer mobile terminal, also can avoid in battery management process, occurring maloperation based on wrong battery electric quantity.

Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.

Claims (10)

1. a detection method for battery electric quantity, is characterized in that, comprises the following steps:
Voltage to described battery is sampled;
Voltage on sampled voltage and constant-current discharge curve is compared, obtain the affiliated voltage section of described sampled voltage, wherein, described constant-current discharge curve obtains in advance described battery being carried out to constant-current discharge test, and is divided at least two voltage sections according to slope;
Calculate described battery current voltage rate of change;
The trial voltage rate of change of described current voltage rate of change and affiliated voltage section is compared and obtains voltage change ratio error, and wherein, described trial voltage rate of change changes test acquisition for described battery being carried out under affiliated voltage section to discharge current;
From preset affiliated voltage section is lower search under the corresponding voltage change of described voltage change ratio error voltage section, wherein, described mapping table changes test by described discharge current and obtains;
Calculate the voltage of described battery according to described sampled voltage and the voltage change finding;
Obtain the electric weight of described battery according to the voltage of the battery of described calculating.
2. the detection method of battery electric quantity as claimed in claim 1, is characterized in that, the trial voltage rate of change of described current voltage rate of change and affiliated voltage section is compared and obtains voltage change ratio error, specifically comprises:
Calculate the ratio between described current voltage rate of change and described trial voltage rate of change.
3. the detection method of battery electric quantity as claimed in claim 1, it is characterized in that, voltage change ratio error range comprises the first error range increasing successively, the second error range, the 3rd error range and the 4th error range, described voltage change comprises the first corresponding with voltage change ratio error range successively voltage change, second voltage adjusted value, tertiary voltage adjusted value, the 4th voltage change, wherein, described the first voltage change is zero, described second voltage adjusted value, tertiary voltage adjusted value and the 4th voltage change are determined by the empirical value of battery constant-current discharge.
4. the detection method of battery electric quantity as claimed in claim 1, is characterized in that, described discharge current changes test and comprises:
Discharge current increases and continues the test that the schedule time reduces afterwards again;
And/or, the test that discharge current increases after reducing and continue the schedule time again.
5. the detection method of battery electric quantity as claimed in claim 1, is characterized in that, described sampled voltage was the sampled voltage in a upper sampling period.
6. a pick-up unit for battery electric quantity, is characterized in that, comprising:
Memory module, for preserving the battery constant-current discharge curve with at least two voltage sections, the mapping table of each voltage section voltage change ratio error range and voltage change in trial voltage rate of change and described battery constant-current discharge curve, wherein, described constant-current discharge curve obtains in advance described battery being carried out to constant-current discharge test, and described at least two voltage sections are divided and are obtained according to described constant-current discharge slope of a curve, described trial voltage rate of change obtains for described battery being carried out under affiliated voltage section to discharge current variation test, described mapping table changes test by described discharge current and obtains,
Voltage sample module, for sampling to current voltage;
Comparison module, for comparing the voltage on sampled voltage and constant-current discharge curve to obtain the voltage section under described sampled voltage;
Computing module, for calculating described battery current voltage rate of change;
Voltage change ratio error calculating module, for comparing to obtain voltage change ratio error by the trial voltage rate of change of described current voltage rate of change and affiliated voltage section;
Table look-up module, the corresponding voltage change of described voltage change ratio error under voltage section under searching in the mapping table for voltage change ratio error range and voltage change the affiliated voltage section of preserving from described memory module;
Voltage computing module, for calculating the voltage of described battery according to described sampled voltage and the voltage change finding;
Electric weight computing module, for obtaining the electric weight of described battery according to the voltage of the battery of described calculating.
7. the pick-up unit of battery electric quantity as claimed in claim 6, is characterized in that, also comprises:
Display module, for being presented at the electric weight of the described battery of described electric weight computing module calculating at the interface of mobile terminal.
8. the pick-up unit of battery electric quantity as claimed in claim 6, is characterized in that, described discharge current changes test and comprises:
Discharge current increases and continues the test that the schedule time reduces afterwards again;
And/or, the test that discharge current increases after reducing and continue the schedule time again.
9. the pick-up unit of battery electric quantity as claimed in claim 6, it is characterized in that, voltage change ratio error range comprises the first error range increasing successively, the second error range, the 3rd error range and the 4th error range, described voltage change comprises the first corresponding with voltage change ratio error range successively voltage change, second voltage adjusted value, tertiary voltage adjusted value, the 4th voltage change, described the first voltage change is zero, described second voltage adjusted value, tertiary voltage adjusted value and the 4th voltage change are determined by the empirical value of battery constant-current discharge.
10. the pick-up unit of battery electric quantity as claimed in claim 6, is characterized in that, described sampled voltage was the sampled voltage in a upper sampling period.
CN201010575004.4A 2010-11-26 2010-11-26 Electric quantity detection method and device for battery CN102478636B (en)

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